tubing material

Jackchips

there was a shortage of copper and manufacturers were making pipe out of a combination of copper and, I believe, alluminum. It was very thin, poor quality and did not seem to be on the market for long. I do not recall what it was called but it did look similar to your picture.

antman

anyone know what this is?

I am in the process of installing homeruns of Wirsbo multicore from hot water convectors to a manifold. When I started to remove the tubing from the elements came across this stuff, never seen it before, to me it looks a little like galvanized electrical conduit, but is thicker and the o.d. is definatley 5/8", not that it really matters because I will be able to remove all of it, i'm just curious as to what type of tubing it is, how it was soldered to copper fittings and how it survived being embeded in cement in the garage ceiling.

Thanks, Ant

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Steve Bergerson

Looks like

Looks like coroded copper

MURPH'

could it be......

the mysterious bundy tubing ??



Murph'

Alan(CaliforniaRadiant)Forbes

Bundy Weld

From a previous thread:

Date: January 17, 2003 10:34 AM
Author: mark (tim@carlsonmech.com)
Subject: radiant tubing

Ran across a radiant tubing that I can't identify? The house was built in 1949. The 1/2" tubing was suspened below floor and painted black. After sanding off the paint expecting copper I found a stainless metalic shine, the product used is not black steel, but it is magnetic,bendable and it does have welded/brazed joints. What might this product be? Thanks Mark!

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Date: January 17, 2003 10:55 AM
Author: Eric R (ericr@wrightplumbing.com)
Subject: Bundy tubing I think

Anyway thats what we call it, I think it was used during WWII and after. I have been successful in soldering it but it is very touchy to excessive torch heat. If possable use compression couplings to do repairs. EricR

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Date: January 17, 2003 10:57 AM
Author: Alan(CaliforniaRadiant)Forbes (adforbes@pacbell.net)
Subject: Sounds like

Bundyweld which was made during the war years and is some type of copper/steel composite.

A lot of it was used here in the Bay Area for radiant, but I think most if it has failed by now since it didn't hold up well becuase of the ferrous component.

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Date: January 17, 2003 11:01 AM
Author: Alan(CaliforniaRadiant)Forbes (adforbes@pacbell.net)
Subject: There you go

Both Eric and I posted at the same time....with the same answer.

I always used to think Bundyweld was a west coast phenomenon or a name the old timers came up with, but I guess it's a true product name.

By the way, Eric: what part of the country are you from?

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Date: January 18, 2003 12:24 AM
Author: Sven (svenselander@hotmail.com)
Subject: Bundyweld ..

still looks like it is made:

http://www.lapham-hickey.com/Products/SteelTubing.cfm

Check out this tidbit:

"William, double-flaring hard lines is mandantory IF you use std steel brake line, which is also known as "Bundyweld". Bundyweld is rolled sheet steel that is furnace- brazed together to make a tube; single-flaring will almost always split it at the braze line, causing a leak. Double flared bundyweld does not split. This by the way is '30s technology that was never updated. Conversely, it is almost impossible to double-flare stainless steel tube because of the instant work-hardening it does. So for SS, I think single flare is OK- we used single flares on ss tubing in Lockheed's spacecraft w/no problems. And remember, bundyweld is the only "official" DOT-certified hard line except for Pat Mical's Future Auto ss hard lines. Don't know which flare Pat uses. J"

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Date: January 19, 2003 09:37 AM
Author: EricR (ericr@wrightplumbing.com)
Subject: Alan

I'm in Colorado Springs, We have an area of town that used Bundy tubing for interior domestic water and baseboard heat lines.


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Heatermon

Could be Olin tube

A steel and copper combination that I remember back in the 70's (I was in my teens then). It was a cheap alternative to copper tube and could be soldered like regular copper. Anyway, thats my guess.

Heatermon

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Jackchips

That name

and time frame sounds familiar. Thirty years adds way too much info to the brain which causes v e r y s l o w recall. :-)